It doesn't look like a galley cart to me not with the screws around the out side of the door, it almost looks like an in floor safe of some desription.
The thing that really has me baffled is the red handle on the side of the box?

The other thing i have noticed is the blue cover on the door it is the same none slip surface you find on the floors of galleys etc

To me, it doesn't look like anything near the center console or anything else near the floor. Looking at the photos, there appears to be a ceiling above the box. If I had to guess, I'd say it's for storing the aircraft's AFM, MEL, or other aircraft library-type items. Then again, maybe that's where the crew's Uzis and ammo clips are stored...